Loic Remy acted the part of super-sub after scoring a goal late on in the second half to put Chelsea back in the lead against Hull, but only thanks to another goalkeeping howler, this time from Allan McGregor.
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The Frenchman had been on the pitch for a couple of minutes, having replaced Diego Costa, when with his first touch he fired a shot on goal, that somehow squirmed past the Scottish goalkeeper.
The fifth goal in the game would have come as a relief to Jose Mourinho, who had seen his side pegged back to 2-2, having taken a two-goal lead in the first ten minutes.